Description Of The Firmware; Functional Description Of Temperature Control - Siemens SIMATIC S5 Manual

1

Description of the Firmware

1.1 Functional Description of Temperature Control

A Off switch for controllers (heating switch)
AI 0 to 14 Analog inputs (channels 0 to 14)
AI 15 Compensation input (channel 15)
HCR Heating-cooling ratio
H Manual manipulated variable
D
K Controller gain
P
T Derivative action time
D
Fig. 1.1/1 Function diagram of the controller
The controllers are stored in the form of an algorithm in an EPROM as continuous controllers with
pulse output (pulse-duration modulated). The controllers are switching 2-step or 3-step controllers
with percentage output. The 13 control loops are processed cyclically in the processor section of
the module.
The module is configurable within certain restrictions. The firmware contains a set of functions from
which the required functions can be selected. This selection is made by setting bits in control bytes
and main control bytes.
The parameters for the controllers are transferred to the module for each controller separately in
one or two messages.
IP244
C79000–B8576–C860–02
Description of the Firmware
T Integral action time
N
W Smoothed setpoint
W Temperature setpoint
e1
W Lower setpoint
e2
X System deviation
d
X Corrected analog value
korr
4–5